PDF malware analysis — malicious · c39d627b9263c0e7

MALICIOUS

PDF

7.0 KB Authoring application: Jostiqocerozije (via 85159Jauazoskodqui)

MD5: e5bc887f1015b010f6a41e5a6f7169ac SHA-1: b2200657f166725ff0cb81fcc075bbc20fe5ea44 SHA-256: c39d627b9263c0e7381e52484f5f6d6224fc8d17f9a527c12d86fe61bf11ce4f

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The ML classifier and ClamAV also flagged it as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obfuscated. The presence of JavaScript within a PDF is a common technique for delivering malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

Heuristics 4

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `8346f7f632eb0f06a84427cabbcd74ed9e1fdfc8d4b8d8b00c7a05dc29cb6800`	pdf-javascript-stream	PDF /JS object 11 at offset 0x141D	1827 bytes

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